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Interpretive Summaries:
1999 - Field-specific integrated nutrient management in intensive irrigated rice systems
1998 - Field-specific integrated nutrient management in intensive irrigated rice systems
1996 - Field-specific integrated nutrient management in intensive irrigated rice systems
Field-specific integrated nutrient management in intensive irrigated rice systems, 1999
This multi-national project aims at developing and disseminating a new approach for site-specific nutrient management (SSNM) in intensive rice systems of Asia. In 1999, major progress was made in the theoretical work as well as in field testing. A Nutrient Decision Support System for rice and a handbook, Nutrient Management in Rice were developed. Field-testing continued in 205 farms at eight sites in China, India, Vietnam, Thailand, Indonesia, and the Philippines. Results obtained to date indicate that yield increases on the order of 10 to 20 percent, or 0.5 to 1 t/ha, can be obtained through more balanced NPK application and better timing of N fertilizer. On average, N use efficiency increased by 50 percent across all sites and climatic seasons, while negative K balances were reversed. The whole approach appears highly profitable, with returns on investment of approximately 6 to 7:1. The average increase in net profit was US$45 over farmers’ practice in the second year of field-testing. In September 1999, an international workshop was held to summarize results of two years of field-testing. A work plan for future activities is being developed. The project is expected to use whole farms as demonstration units and to test SSNM at village levels during its proposed last stage. INDONESIA-19
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